Browsing: Puzzle

February 23, 20263 min read Add Us On GoogleAdd SciAmWho should shovel the snow? This weird math puzzle can helpBlizzards are a real-life example of what…

Earlier today I set you this logic puzzle. Here is is again with the solution.(If you found it too simple. Here’s a harder version.)Head sumsAde, Binky,…

If the cards shown here are rearranged to form four new poker hands of five cards each, what is the lowest possible winning or tying hand?When…

The nine rectangles A, B, C, D, E, F, G, H and I overlap one another. Rectangle A intersects rectangles D and F; this relation can…

November 12, 20253 min readFinal Clues to Mystery of CIA Kryptos Puzzle Released“Kryptos has not been solved,” said artist Jim Sanborn after releasing his parting clues…

Earlier today I set you the following puzzle. Here it is again with the solution.Two dead at the drink-offIn a far away land, the following facts…

Spektrum der Wissenschaft, restyled by Amanda MontañezThe hour, minute and second hands of this clock are all the same length and move smoothly in a circle.…

One string in each of the following pairs can be unraveled into a circle—the so-­called unknot. Which one is it?Show puzzle solutionThe knots at the top…

Draw four lines beginning and ending at the gray points to break this square into pieces that can be rearranged into five identical squares.Show puzzle solutionBonus:…

A variation of a puzzle called the “pick-up sticks problem” asks the following question: If I have some number of sticks with random lengths between 0…